Contact bar for electrical warp stop-motions



0. V. PAYNE CONTACT BAR FOR ELECTRICAL WARP STOP MOTION Filed June 20, 1930 Wm. H

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Patented Aug. 4, 1931 UNITED STATES:

PATENT OFFICE OSCAR v. PAYNE, or woRCEsTEn, MessACnnsnTTs, ASSIGNOR To CMPTON & KNOWLES LOOM WORKS, or woRCEsTEn, MASSACHUSETTS, A CORPORATION or MASSACHUSETTS CONTACT BAR non Ell-ECTRIGAL WARP sToP-MoTIoNs' Application filed June 20,

This invention relates to improvements in electric warp stop motions, and it is the general object of the invention to improve upon constructions heretofore used to the end that the contact bar may have its component parts more rigidly secured together.

In a form of warp stop motion which has gone into general use there is employed a contact bar having a substantially U-shaped gro'unded outside electrode which supports a live insulated electrode having the upper part thereof exposed to Contact with the inclined edge of a drop wire. In such constructions as heretofore made the live bar is held in position frictionally and if the insulation shrinks said live bar is not held tightly in position. 'It is an important object of my present invention so to form the grounded and live electrodes as to prevent separation of the same by a lateral movement of the live electrode away from'the grounded part. This result I accomplish by making complemental deformations in the two electrodes efiective to prevent transverse movement of the live electrode relatively to the grounded or outside part of the bar.

With these and other objects in view which will appear as the description proceeds, my invention resides in the combination and arrangement of parts hereinafter described and set forth in the claims.

In the accompanying drawings wherein a convenient embodiment of my invention is set forth,

Fig. 1 is a side elevation of a warp stop motion made according to my present invention, certain parts being in section,

Fig. 2 is an enlarged vertical section of a portion of F ig. 1 showing the drop wire properly supported and out of contacting relation with respect to the two electrodes,

Fig. 3 is a front elevation taken in the direction of arrow 3, Fig. 2,

Fig. 4 is a fragmentary detail of a modified form of bar, and

Figs. 5 and 6 are detailed vertical sections on line 5-5 and 66, respectively, of Fig. 4:.

Referring to Fig. 1, the loom frame 10 has a bracket 11 secured thereto in which is adjustably held a vertical post 12. A support- 1930. Serial No. 462,652.

ing threaded rod 13 is held by a set screw 14: in fixed relation with respect to the post and has strung therealong a plurality of units 15 between which are located separator bars 16 located below the rod 13. The units are formed as shown in Fig. 1 to provide suitable supports for the Contact bars to be described hereinafter. The matter thus far described is in common use and may be used in conjunction with any' suitable electrically operated stopping device.

My present invention relates more particularly to the form of contact bar, and in carrying the preferred form of my invention into effect I provide an outer grounded shielding electrode member 20 which may be made of flat sheet metal stock rolled or bent I substantially to the form shown in Fig. 2 and having a left hand Vertical substantially straight wall 21, and a right hand wall 22 the upper part of which is curved inwardly as at 23. The live electrode 24k has a lower vertical part 25 located between-the walls 21 and 22 and has a longitudinal rib 26 intermediate the upper and lower edges thereof.

The rib 26 is in substantial alignment with the bent part 23. Sheet insulating material such as treated paper indicated at 2? lies between the electrodes and has the upper right hand part thereof pressed into the depression 28 formed by the rib 26 by the upper curved edge 23 so as to prevent relative upward movement of the live electrode with respect to the grounded shield. The top of the live elect-rode extends above the rib 26 to have engagement with the top of a slot formed in a suitable drop wire I).

In the modified form of the invention, shown in Figs. 4, 5 and 6, a substantially U-shaped outer electrode 30 has vertical walls 31- and 32, respectively, between which extend a substantially flat live electrode 33.

At spaced intervals the wall 31 is provided so constructed that'the live electrode is'pre vented from moving upwardly with respect to the grounded shield due to the fact that certain parts of the shield and insulating material lie in the path which the electrode 33 would be required to take if it attempted to move upwardly. The sheet of insulating material 37 may be interposed between the electrodes of the modified form.

The drop wire B has a slot 50 the upper end of which is formed with an inclined surface 51 to have electric contact with the projecting live electrode when the drop wire falls. Due to the inclination of the surface 51 the drop wire will be moved laterally into contact with one of the vertical walls of the inclosing vshield.

'From the foregoing it will be seen that each form of the. invention sets forth a contact bar wherein the live and grounded electrodesare interlocked by having both of said bars provided with aligning deformations so placed as to prevent separation of the live and grounded electrodes. In the preferred form it will be seen that the result set forth is achieved by rolling a stiffening rib in the live bar to cooperate with the curved end in the groundedelectrode, whereas in the modified form spaced struck-up parts talre the place of the longitudinal deformations in the preferred form. In the construction of the bar as set forth herein the outside member will be pressed tightly against the insulation, but if any springing of the two vertical walls of'the inclosing electrode results after the pressing tools are removed the live contact bar will nevertheless be held against displacement with respect to the other part of the contact bar.

In the modified form of the invention it will be observed that longitudinal movement of the two electrodes is prevented as well as transverse separation in a direction parallel to the walls of the inclosing electrode and this feature is particularly important when the parts of the bar are made of sheet metal.

Having thus described my invention it will be seen that changes and modifications may be made thereinby those skilled in the art without departing from the spirit and scope of the invention and I do not wish to be limited to the details herein disclosed, but what I claim is: v

1. In a contact bar for an electrical warp stop motion, an inclosing electrode having two spaced substantially parallel'walls, a second electrode between said walls and insulated therefrom, and means on said electrodes defining aligned deformations which resist relative movement of the electrodes in a direction transversely of the contact bar and substantially parallel to the walls, the deformations lying within the outline of the inclosed electrode.

2. In a contact bar for an electrical warp stop motion, an outer inclosing electrode having spaced substantially parallel walls, a second electrode located between said walls and insulated therefrom, said second electrode having a portion thereof bent out of the plane thereof, and one of the walls of the inclosing electrode having apart aligning with said portion of the second electrode to resist movement of the second electrode transversely of the bar in a direction parallel to the walls.

3. In a contact bar for an electrical warp stop motion, an outer inclosing electrode formed of a bentpiece of sheet metal and having two substantially parallel spaced walls, an electrode lying between and insulated from said walls, andaligning deformations on said electrodes which overlap along a line parallel to the said walls, to resist movement, of the second electrode transversely of the bar in a direction substantially parallel to the walls.

f. In a contact bar for an electrical warp stop motion, an outer inclosing electrode OSCAR v. PAYNE 

